Grinding, mixing, and sifting machine.



` W. H. LISH. GHlNDINLf, MIXING, AND SIFTING MACHINE.

AlY'LIATll-)N FUJED SEPT.12, 1908.

Patented Aug. 3, 1909.

PATENT OFFICE.

WILLIAM H. LISH, F YORK, PENNSYLVANI.

GRINDIN'G, MIXING, AND sIF'rINo MACHINE.

sistematica f Letter-s Patent.

rimmed-ang. s, ieee.-

Appncaaon ined september 12, 190s. serial no. 452,720.

To all whom it may concern:

.I e it known thatI, WILILIM H. Lrsn, a cltizen of the United-.States of America, and 'i resident of York, in the county of York and State' of lPennsylvar'ria,` have inventedV certain new` and useful Improvements in` Grinding, Mlxing, and Sifting Machine/s, of which the `foll'owlngls a 'full and clear speciiication, reference belng had to the accompanying draw 1n s, inwhi'chligure 1 is a vertical sectional view of an apparatus constructedaccording to my in- Ventron; Fig. 2 is a perspective view in detail o'f the stirrer; Fig. 3 is a section through a portlon of the intersectingtooth surfaces of one of the rolls; Fig. 4 is a detail plan of the tooth face of the concave; and,'1*`ig. 5 is a lletall planA of the tooth face of one of the T0 S.

The object of this invention is to provide a simple apparatus for grinding all sorts of materials, especially fertilizers, means being I provldedA for very thoroughly and quickly finely comminuting the materials and stirl ring and sifting the same and for rc-grinding the tailings Without removing the tailings from the machine, as more fully hereinafter set forth.

Referring to the drawings by reference 30. characters, a designates the casing which may be any suitable shape and size and which is provided with a suitable intake or ho` )per ,b leading to the pair of rolls c for preliminarily breaking up and cutting the material,

these rolls being used only when-thc material is of such a nature, as when grinding corn stalks, as to make it desirable or necessary to break up the material before it is presented tothe main grinding rolls cl locatedin the casing justbeyond the rolls c in such a position as to receive the material as it combs fromA the rolls c.

The rolls are driven in an suitable well known manner,v the lower rol s being preferv ably driven at a faster rate thanthe up )er rolls lso as to not `only feed the material ut to exert a grinding or cutting' action. As the material passes between the main rolls d it is partly ground and passesdownwardly be tween the concave c and tho lower one of the rolls d and is thus subjected to i additional grinding action. The upper edge e of the concave is extended u wardly to form a hopper-like space c whic i is adapted to rccelvc the material as it comesfrmn between the rolls l and to direct it downwardly between the concave and its roll. A vertically mmable gate f, working down through ain open ing in the casing and coming into Contact with the upper end e of the concave se a to rate the hopper c from the mixing cham o of the apparatus. The material' after it passes the concave falls into the mixing chamber and is thoroughly mired by a rotary stirrer consisting of a shaft 'hy radial arms i, and blades j attached to the outer ends of the arms or spokes i and arrangedv spirally around an' imaginary cylinder;y The bottom of the casingis approximately semi-cylindrical so that the' lower halfof' the to stirrorts close to the inner wallofsaidsemi cylindrical portion. The inner'`V walt of the. concave is also ap'. roximately semicylinf drical to conform substantially to the curva.` ture of the stirrer blades and; approach closely thereto. `In the bottom of the casingv is a curved screen 7c adapted to sift. out the portions that are sulciently comminuted to pass through the meshes thereof.` This screen may be made removable so that a0 screens of various meshesmay be substituted i therefor. It will be observed that the adjacent blades j `A`extend in opposite directions around an imaginary cylinder so that as the stirrer is rotated thesucceeding' blades willengage the stratum of material adjacent kto the concave bottom of the casing and shove it 'first toward one end of the casing and. then toward the other end thereof7 this alternate action being carried on rapidly'and continuously, thus serving to very thoroughly stir and sift. the material in the hoppen. When grinding materials too damp t o` be screened the screen, and the stirrer too if desired, may be rcmoved'entircly so thatl the ground material may fall directly out 0i the casingwithout hindrance.

Inasmuch as it would be practically am# possible to prevent a email portion "o`l""the materials passing-between he rolls Without being thoroughly ground, it is. necessary to re-grind such materials. When enough inaterlal collects in the casing the feed may be stopped and the gate f raised,whereupon the unground materials, e. e. tailings, Wlll be thrown by centrifugal force by the'stlrrer intothe hopper e of the concave and thus re-grind the tailings without removing them from the machine.

The faces of the rolls rl are-provided with parallel circumforontial grooves l annroxi- Bisi" AVAILABLE copy mately V-shape in cross-section and alson with parallel longitudinaly grooves fm of substantiall the same sha e in cross section except t at the rear wa m of the grooves is not inclined but is approximately radial, thus forming pointed teeth approximatel saw-tooth shape in cross-section. The rol s are vmounted sufficiently close together to permit the teeth of one roll to Workjreely through the circumferential grooves. ofthe companion roll. With thefteeth of the rolls arranged in this manner a very thorough. cutting and grinding action is secured, es ecially in view of the fact that oneof the. ro ls is rotated faster than the other. The face of the concave e is rovided with grooves n running longitudinal yof it and the concave is so positioned` with reference to the roll that the teeth of the roll Work in said grooves n, their` pointed ends extending nearly tothebottom of the grooves. The concave is also provided with intersecting grooves o approximately V-shaped in crosssection except thatthe rear wall in each groove is approximately radial. Every third one of these grooves o is carried into the concave deeper than the remaining grooves 'o and also deeper than the longitudinal grooves n, thus forming a series of transverse pocket-like channels. Itwill beob-` served that the .coa/cting 'teeth of the lroll and concave, the teeth of each being approximately the same shape in cross-section as the grooves of the other member, will thoroughly and finely grind and cut the materials whatever bev their nature. The deeper ones of the grooves' o 'receive the partly ground materials and insure the fine particles being turned or rotated and presented to the succeeding cutting edges of the teeth in a different position, thus reventingspokes or arms, andA a series of stirrer-blades attached to said arms, these blades being spirally arranged and the adjacent blades running in opposite directions and being connected together at their adjacent ends, forming a continuous zigzag spiral extending back and forth the full length of the stirrer, for the purpose set forth.

2. In a grinding machine, a casing, a pair of grinding rolls therein arranged one labove the other, a :concave grinder' cooperating with the under surface of the lower roll and having an upward extension forming Va hopper-like throat to receive the materia-ls from the rolls, avertically-movable gatev back of the upper roll and adapted to engage'the upper end of the vextension of the concave, a screenin the bottom of the casing, and a rotarystirrer therein, all for the purpose set forth. In testimony whereof I hereunto affix my signature in the presence4 of two/witnesses this 11th day of September [1908.

. WILLIAM ILLISH.

Witnesses'z CnAs. M. GARLINGER, y S. D. WAREHEIM.

-vided with a screen, a shaft carrying radial v 

